Originally Posted By: psabados This post was automatically imported from our archived forum.
Sorry to say yes
It will depend upon where the stone or rock comes from. If its mined or quarried from a known area with high radon tailings they could be bringing it indoors.
A vapor barrier alone may no be sufficient. Maine mostly is considered a Zone 1 with higher occurances of readings over 4.0 PiC/l. http://www.epa.gov/radon/
Originally Posted By: jcampbell This post was automatically imported from our archived forum.
I suggested the vapor barrier for moisture reasons alone… the radon levels were low enough to not be a concern. I initially thought NO to his question, but as I thought about it… it made sense it could increase radon air levels.
I believe if he adds the crushed stone he should take other measures to ventilate/remove possible radon gases in addition to the vapor barrier...
Originally Posted By: lkage This post was automatically imported from our archived forum.
Out of curiosity, why doesn’t he just have it tested again after the rock is installed? It may be fine and require no extra cost to remove it. Testing again would cost less than mitigation.
Originally Posted By: dvalley This post was automatically imported from our archived forum.
When Radon mitigations are installed they utilize crushed rock or gravel in order to provide a drainage bed for moisture and a stable, level surface for pouring the slab.
Wouldn?t you think that they would be adding wood to the fire if the crushed stone contained high Radon levels?
Originally Posted By: jcampbell This post was automatically imported from our archived forum.
Sorry Dave, I missed your question earlier… Testing for radon is very popular, but the test would have to be conducted after installed in the crawl space. I explained that to the client. he is considering his options and won’t proceed until spring… Radon runs 100-125 up here as well… although I recently heard someone conducting them for 85.00 ??